books.google.com - Current technology for solar-electric propulsion is used to assess the potential performance advantages of low-thrust propulsion for an out-of-the-ecliptic mission. Simple normal-to-the-orbit thrust steering is assumed with coast subarcs permitted. The electric spacecraft is launched onto an Earth escape...https://books.google.com/books/about/Early_application_of_solar_electric_prop.html?id=_e55e-iCWnEC&utm_source=gb-gplus-shareEarly application of solar-electric propulsion to a 1-astronomical-unit out-of-the-ecliptic mission